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31

Compasses are good equipment both spelunking and diving. Even the deepest cave you could go to is still near the earth's surface, geologically speaking. The earth's magnetic field is also essentially the same under water as above. If you are using a compass, what you need to be aware of is nearby magnets and large sources of iron. So if you were exploring ...


6

There's cheap and there's too cheap! Remember - this is a tool you may be trusting with your life... For any kind of serious navigation you need a baseplate compass rather than the button type in your image. This is so you can take reliable bearings from your map to the land and back-bearings from the land to your map. Even the entry-level baseplate ...


5

Inexpensive compasses in general are fine. Even from a good brand the base models are not much more than the price of a few beers. Indeed in most cases these are all you ever need. However cheap button compasses are a bit suspect. To be fair it looks like that picture is 4 separate images photoshopped over a background so the fact that the indicated ...


1

Consider the question in the terms of basic physics. Essentially, the magnetic pull of the earth and needle's magnet creates a torque on the compass (wheel / disk / needle etc. ) causing it to rotate. In an ideal compass, the torque meets only dampening resistance - you don't want the needle to move too quickly or you will get an oscillation while hunting ...



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